Remove pallet::getter usage from merkel mountain range pallet

prdoc/pr_10437.prdoc

@@ -0,0 +1,7 @@
+title: Remove pallet::getter usage from merkel mountain range pallet
+doc:
+- audience: Runtime Dev
+  description: 'Advances #3326'
+crates:
+- name: pallet-mmr
+  bump: minor

substrate/frame/merkle-mountain-range/src/lib.rs

@@ -222,15 +222,13 @@ pub mod pallet {
 
 	/// Current size of the MMR (number of leaves).
 	#[pallet::storage]
-	#[pallet::getter(fn mmr_leaves)]
 	pub type NumberOfLeaves<T, I = ()> = StorageValue<_, LeafIndex, ValueQuery>;
 
 	/// Hashes of the nodes in the MMR.
 	///
 	/// Note this collection only contains MMR peaks, the inner nodes (and leaves)
 	/// are pruned and only stored in the Offchain DB.
 	#[pallet::storage]
-	#[pallet::getter(fn mmr_peak)]
 	pub type Nodes<T: Config<I>, I: 'static = ()> =
 		StorageMap<_, Identity, NodeIndex, HashOf<T, I>, OptionQuery>;
 
@@ -338,7 +336,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		// `block_num = (current_block_num - leaves_count) + leaf_idx + 1`
 		// `parent_block_num = current_block_num - leaves_count + leaf_idx`.
 		<frame_system::Pallet<T>>::block_number()
-			.saturating_sub(Self::mmr_leaves().saturated_into())
+			.saturating_sub(NumberOfLeaves::<T, I>::get().saturated_into())
 			.saturating_add(leaf_index.saturated_into())
 	}
 
@@ -462,4 +460,14 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	pub fn mmr_root() -> HashOf<T, I> {
 		RootHash::<T, I>::get()
 	}
+
+	/// Returns the current size of the MMR (number of leaves).
+	pub fn mmr_leaves() -> LeafIndex {
+		NumberOfLeaves::<T, I>::get()
+	}
+
+	/// Returns the hash of a node in the MMR, if one exists.
+	pub fn mmr_peak(node_index: NodeIndex) -> Option<HashOf<T, I>> {
+		Nodes::<T, I>::get(node_index)
+	}
 }